(MOUNT KATAHDIN, MAINE) — A man has been found dead and his daughter remains missing while attempting to hike to the summit of Mount Katahdin in Maine, officials said Tuesday.

Tim Keiderling and Esther Keiderling, both of Ulster Park, New York, set out to hike the summit on Sunday, according to the Maine Department of Inland Fisheries & Wildlife.

They were last seen Sunday morning on the Katahdin Tablelands heading toward the summit, which is the northern terminus of the Appalachian Trail and located in Baxter State Park.

Baxter State Park rangers began searching for them Monday morning after their vehicle was still found parked at the trailhead in the day-use parking lot, park officials said.

The search on Katahdin expanded Tuesday to include the help of more than 30 Maine game warden

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